Apparatus for concentrating liquids to high densities.



P. K-EST NBR.

APPARATUS FOR OONUENTRATING LIQUIDS TO HIGH DENSITIES.

APPLICATION FILED JUNE 23, 1911.

Patented Mar. 177, 1914i.

r ww mu zen ofthe Republic of France, and a of Lille, Department N ord,France, have in- I nnitrunsrntrns PATENT OFFICE.

PAUL KESTNER, or LILLE, FRANCE,- Assxenon T0 KESTNER EVAPORATOR COMPANY,

OE PHILADELPHIA, PENNSYLVANIA,

A CORPORATION OF PENNSYLVANIA.

APPARATUS FOR. CONCENTRATING LIQUIDS v'10 HIGH DENSITIES.

Specification of Letters Patent.

Patented Mar. 17, 1914.

Original application filed June 20, 1e10, Serial vNo. 567,956. Dividedand this application filed June 23,

To all whom it may concern} I I Be it known that I, PAUL KESTNER, .acitiresident rented certain Improvements in Apparatus for ConcentratingLiquids to High Densit es,of which the following is a specification.

TlNS invention relatest'o that class of evaporating apparatus in whichthe liquid treated passes through the'evapora'tor in the form of filmand inwhich the operation is continuous; One object of'the invention isto provide anovel form of apparatus particularly de- A0. 567,956, filedespecially desired that the. apparatus shall signed for carrying out theprocess described and claimed in my application for Patent June 20,1910; it being be capable of successfully evaporating'toja high densityvarious vegetable and other extracts as well as VISCOUS llquids orliquids containing sensitive colloid matters.

These objects and other advantageous ends I secure as hereinafter setforth, reference being had to the accompanying drawings, in which;-Figure 1, is a vertical section to some extent diagrammaticillustrating, one form of my evaporating appapatus; Fig. 2, is avertical section illustrating a somewhat similar form of the apparatusshown in Fig. 1, and

Figs. 3 to 5 inclusive are modifications. of my invention. I

Referring to Fig. 1, the liquid to be. concentrated or evaporated issupplied from a tank or container 1 which is connected;

through pipes 2 and 3't0 the first ofa series oi tubes 4', 5, 6, and 7-.I Said'tubes are connected. together in series, thatis, the pipe 3 isconnected to one end of-the'tube twhose opposite end isconnected to theupper end of the tube 5. The tubefi has its lower end connected to saidtube'5 and its other end connected to the upper end of thetube 7 and allof said tubes are inclosed within a casing or heating jacket 8 suppliedwith heating fluid, such as steam through a suitable inlet. 9. therebeing, if desired, an outlet (not shown) for carrying ofi thewatcrcondensing in the casing. The lower end of thotube 7 in thisinstance is connected to a separator [0 having a bottom outlet 11 forcolleen-- trated liquid, and a conduit 12 leading from 1911. 'SeriaINo.634,910.

pump 15 is preferably connected to recelve liquid from the pipe 2 and todeliver it into the pipe 3, since under operating conditions there isusually pressure in the tubes '4, 5,6, and 7 When steam is suppliedto-the casing through the'inlet 9, the liquid which is-fed into the pipe4 by the pump 15 is distributed over the interior wallbf the evaporatingtube in accordance with the well recognized film. Under these conditionsthe vapor rom the liquid travels as a central core through the tube andcarries with it the caused'to rise in film form and is shortlyl'iisprinciple of the climbing liquid film onthe walls thereof and as saidliquid passes into the tubes 5, 6 and 'Z,sai'd film becomes thinner andthe volume ofvaporbecomes greater, with the result that its velocity isvery materially increased, so that the liquid film is exposed to thehi htemperature of the tubes for buta relative y short time before itisdischarged into the separator 10. 5

It is, of course, obvious that the-lengths of the evaporating tubes asWellv as theirnum ber may be varied to suit the various liquids which itisdcsired to evaporate or concentrate, although I have found itadvisable to always so arrange the tubes that the liquid flowsdownwardlyfrom the ,last one through which it passes; the object ofthisarrangement being lO SBCLII'QtllB aid of causlpg the highly concentratedand relatively. (lense'viscous fluid to flow..

Fig. 2, represents a relatively simpIeforminto areceiving tank 14.

Asshown in Fig. 3,-each ofthe various evaporating tubes may have its ownheating casing '8 so that the tube 4:, for example, maygravity in beheated. to a temperature different from x that to which the tube 5 israised; it bein'g Only necessary'that' the steam or otherheating agentbe supplied at; different tempera ,tures to said casings.

'In the case of Fig. 4, the apparatus ilhis 'trated is so designed as toreceive at the top of a tube 5 the liquid to be treated; there being inthe casing two other tubes 6 and 7 the latter of which is connected to aseparator 10 similar to that shown in Fig. 1.

According to the construction shown in Fig. 6, each pair of up and downtubes 4 and 5 is contained within a single casing 8; the

- passage through the apparatus; there being preferably three ormorevertical tubes connected in series as described and some means forfeeding the liquid to be evaporated against the pressure generatedwithin the apparatus. As noted the last tube through which the liquidpasses permits a downward flow of the same.

I cla rnz+ a i An -evaporating apparatus consistlng of a plural ty ofmore than two vertical :tubes I connected in SQ11S;'D'l8m1S forsuppiy-ing liquid to be evaporated to one end of ear series of tubes;heating means for the tubes;

with a separator connected to the lower end of the last tube oftheseries; said separator bei'ng'provided with an outlet for liquid and avapor outlet having a back pressure valve.

In testimony whereof,' I have signed my name to this specification, inthe presence of two subscribing witnesses.

Witnessest HENRI CHARRIER, LloN PEoKEL.

- PAUL, KESTNER. y a

